Hydraulic-jack-operating pump



` March 26, 1929.

J. R. MARCUS HYDRAULIC JACK OPERATING PUMP Filed Nov. a, 1926 March 26, 1929. J. R. MARCUS '1,706,456

HYDRAULIC JACK OPERATING PUMP Filed Nov. 8, 1926 2 Sheets-Sheet 2 25 I fome/Yaf'cw fao Patented Mar. 26, 1929.

UNITED STATES y d. 1,706,456 PATENT OFFICE.

JEROME B. MARCUS, OF CHICAGO, ILLINOIS.l

nYnaAuLIc-JAcx-orm'rme mm1.

J Application med November 8, 1926. Serial No. 146,925.

My invention relates to hydraulic acks and more particularly to apparatus ov the above character adapted for portable use, such as for lifting automobiles and other loads, an object being to provide a jack of this character adapted for use in lifting the load wit-hout re uiring the operator to et under the car or oad to place or operate t e jack, thereby permitting-the operator to work For'a better understanding of my inven-` tion reference is to be had to the accompanyino' drawings, in whichig. 1 1s a vertical transverse section through the pump unit; Fig. 2 is a vertical cross section through a suitable jack adapted for use with the pump, both being adapted for mounting upon a single base so as to form a unit structure;

Fig. 3 is a view ofthe reversing valve in a position for releasing the fluid to lower vthe jack, the valve in Fig. 1 being shown vin a position for .pumping the. fluid into the jack to raise the same;

Fig. 4 is a transverse sectional view along the line 4-4 of Fig. 1;

Fig. 5 is a vertical cross sectional viewl along the line 5-5 of Fig. 1; and' the valves more in det-ail. l

Referring now more in detail to the apparatus as illustrated, I provide a suit-able reservoir R which contains the fluid preferably used for operating the jack, and for this purpose oil may be provided which is placed in the reservoir through the cap 10. This reservoir` preferably surrounds the pump P, the reservoir comprlsing an outer circular casing `11 having a cap 12 applied thereto with the casing 11 fixed into the base B. The pump P maybe of any suitable construction and I have shown a cylinder portion 13 havingl a piston 14 operating therein and which may be operated in any suitable manner. I have here shown a handoperated-pump with the pistn rod 15 supporting a handle 16.-

To control the ow of fluid between the pump and jack I provide a valve V- which is in the nature of a two way four port valve with the ports suitably connected to the resp Fig. 6 is a sectional view showing` one 0fervoir and pump so that the liuid may be roperly controlled so that it may be drawn rom the reservoir andpump into the jack with the valve shown in the position of Fig. 1 or with the valve shown in the osition of Fi 3 the fluid maybe forced bac from the f jac through the pump so as to be returned to lhe reservoir and permit release of the ac Y The said valve may be constructed in any suitable manner and I have shown it mounted in the base B and comprising a rotatable gate or plug 17 having passages 18 and 19 terminating in ports adapted to register with the ports leading to passages connected to other parts of the apparatus.

- The fluid from the reservoir is adapted to pass down through a passage 20 leading to port 21 of the valve. Passage 19 of the valve then leadsto port 22 which is connected by the passage 23 to an intermediate chamber 24 having a spring pressed pump inlet valve 25 connected therewith and so positioned that the oil is drawn upwardly throughl this valve lry the upward stroke of the pum piston.

hus with each upward stroke of t e piston oil is ,drawn from the reservoir over the stated path and into the cylinder of the pump. On the down stroke of the piston the oil is forced through the pump outlet valve 26 in the direction of the arrows indicated on the left hand side, the oil then being forced through passage 27 and valve passage 18 to the outlet 28. This outlet is connected by a suitable conduit 29 to the jack J, which latter is preferably in the form of a piston jack adapted to be raised when the fluid is 'pumped into lits cylinder. This jack may be controlled by a valve 30, thus permitting the jack to beheld in a raised posltion by a valveclose to its cylinder.

Referring again to the reversing valve V, the gate member 17 thereof is rotatably supported in the `base as shownralso in Fig. 4, being held in position in a suitable manner and preferably by acap 31 through which the valve stem 32 extends. A suitable operating handle 33 is provided, this being removably secured to the end of the stem 32 and set within a recess of the casing so as to prevent its exposure to accidental operation.

The jack and pump units may be mounted upon a. single'base 34 so that the apparatus as a whole may be used as a portable unit movable from place to place.

In the operation of the apparatus asl-a1-` of the fluid and lowering of the jack ma be accomplished either by thel load itsel orv through the action of the pump. Fory instance, with a heavy load on the jack and the oil in a very fluid state, the reversal of the valve as stated would permit the oil to be forced back into the reservoir by the load on the jack. In such case the oilwould flow over a path from the jack cylinder through passage 28 of the base, valve passage 19 and passage 23 to the chamber 24, then passing upwardly Ithrough valve 25 then through i valve 26, passage 27,'valve passage 18, port 21 and passage 21to the reservoir R. -Thus the -mere reversal of the valve V would permit a restoration of the jack without any other operation.

Assuming, however, that the load is not suliicient to force the oil back into the reservoir, er thatthe oil has become hardened by the cold or -for other' reasons, the reversal of the valve into its uposition'of Fig. 3 and the operation of the pump "P would cause the pump to draw the oil back into the reservoir and lower the jack. This operation 1s brought about in that upon each upward stroke .of the piston of the pump P there is a suction which will draw the fluid from the jack through the lower passage of the Valve into the chamber 24 and then up .through valve 25 intothe pump cylinder. Upon the down stroke ofthe pump piston this duid l which was drawn in on theI last stroke "is now forced th'roughthe outlet .valve 26 but i cannot return through inlet valve 25. From outlet valve 26 the fluid continues through passage 27 and valve passage 28 to conduit' 21 and up into the reservoir R.

manipulation of the valve V the apparatus may be operated to lift the jack vand then by the simple reversal of the controlling valve V the jack may be lowered toforce the oil back into the reservoir, or it may be drawn Iback into the reservoir by the force of the pumpPif necessary.

\What I claim as new anddesre to secure by United States Letters Patent is: 1

l. A hydraulic jack including a'iluid reservoir, a pumpincluding spring pressed inlet and outlet valves for the pump/cylinder, .a piston, amanuall'y operated reversing valve, a jack, and conduits'connecting/the jack, reversing valve,l reservoir and pump valves and means in said reversingv valve for controlling meente said connections to cause the pump to draw the f luid from the reservoir and force it into the ]ack to operate the latter or to cause the pumpto draw thev iuid from the jack and force it' back into the reservoir.

2. A hydraulic jack including a voir, a pump including spring .pressed inlet and outlet valves for the pump cylinder, a piston, a manually operated reversing valve,

a jack, and conduits connecting the jack, re-

versing valve, reservoir and pump valves, and means 1n said reversing valve for controlling said connections to cause the pump to draw the iluid from the reservoir and force it into the jack to operate the latter or t0 cause the pump to draw the fluid from the jack and force it back inte the reservoir with-` out varying the pump valves.

3. A hydraulicl jack including a fluid reservoir; a pump including a cylinder, a

fluid reserpiston, an automatic inlet valve and an automatic outlet valve; a jack, a manually operfated two way controlling valve, and conduits connecting'the valves, jack and reservoir for causing the pump to draw fluid from the res? ervoir and force it-into the jack to operate the latter with the manual valve in one position or cause the pump to draw the fluid from the jack and force it back into the reservoir with the manual valve'in its .other positionu 4. A'hydraulic jack including a duid res# ervoir, a pump including a cylinder, a piston, an inlet valve and an outlet valve; a jack, a two way valve having a gate and'two pairs of connecting ports forming four ports in all,

connections from the reservoir, the two pump valves, and the jack tosaid ports, said valve ports and gate being arranged to connect the pump inlet valve and reservoir, and the pump outlet valve and a jack connected port to operate the jack by the pump, or to connect the pump inlet Valve and jack connected port and thel pump outlet valve and reservoir to release the jack.

5. A hydraulic jack including a fluid reservoir, a pump including a cylinder, a piston, an inlet valve and an outletvalve; a ack, a

two way valve having agate and two pairs It will thus be seen that .the simple of connecting ports, connections from the reservoir, the two pump valves, and the jack to said ports, said valve ports and gate being arranged to connect the pump inlet valve and reservoir, and the pump outlet valve and a jack connected port to operate thejack by the pump, or to connect the pump inletvalve and jack connected port and the pump outlet valve and reservoir to release the j ack during a continued like operation of the pump pistonand the pump to draw 'the fluid from the ,-resere duits in said base connectlng the reservoir,

the pump Valves and the'remaining three ports ofthe two way valve, said connections and two way valve being l arranged to cause Voir and force it through the jack portA into the jack cylinder or draw the fluid from the jack cylinder and force it back into the reservoir according to the position of the two Way valve.

7. A hydraulic jack including a cylinder and piston jack, a pump having a cylinder,

piston, and inlet and-outlet valves, a uid reservoir, a valve in the form of a solid cylinder having two unconnected transverse passageways therethrough terminating in four parts on the outer surface thereof, conduits leading from the jack cylinder, the two valves, and fluid reservoir and terminating at said valve in positions adapting them to be registered with the ports in said valve and means for turning the valveto line the parts up to pump fluid from the jack cylinder into the reservoir, or from-the reservoir into the jack cylinder.

In witness whereof,I hereunto subscribe my name this 1st day of November, 1926.

JEROME R. MARCUS. l 

